Hi Russell,

I'm curious what this is for.  I mean, what is the final product?

Lindy

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of Russell McMahon
Sent: Saturday, July 02, 2005 11:21
To: Microcontroller discussion list - Public.
Subject: Re: [EE] Design Challenge - A better H Bridge


Just to clarify.

No PWM.
Motor is fully on or off.
It drives in either direction as required.
On for from ABOUT 1 second to 20 seconds.
Overlap between directions is processor controllable and usually long 
(30 seconds) so not a problem.

Any parts MIGHT be used but this is a desperately NIMBY situation.
I have already majorly changed a Taiwanese design and getting stuck 
into their H bridge will not make me friends.
Using identical components is a great plus. Whatever I use has to be 
testable in NZ and buildable easily in Taiwan. Parts that I am CERTAIN 
can be got in taiwan are not too bad (eg LM385). Specifying pats that 
SHOULD be easily available in Taiwan can lead to bad surprises. Using 
identical parts makes it certain.

Cost is a main priority but not the overwhelming one.


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